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Not long ago, I came across an interesting kit on Taobao—or, more accurately, not a kit but a converter control board, since it’s also sold separately. Curiosity got the better of me, so I decided to order one and give it a try. There was also a useful story involving the seller. Anyway, it’s best to read about it in the review.

I recently received another little package from Taobao, and I’m slowly starting to publish reviews of the items it contained. I’ll start with some small converter boards, especially since people have been asking me about them. This review covers boards with an input voltage of 36–75 V and a power rating of up to 50 W.

I’ve already reviewed quite a few different boards that can be used to build an adjustable power supply, often called a “laboratory” power supply, so I simply couldn’t pass up a newcomer to this market: the DPXxxxx series of boards. A few of my readers had also asked me to review it. Well, the board has arrived and it works—but am I happy about that? Read on for my review of the board and my conclusions.

I was browsing Taobao and happened to come across a charger that caught my eye with its low price and pretty decent looks, especially for the price. I ordered it, received it, and was somewhat disappointed—twice, in fact. But more on all that in the review. Inspection, testing, conclusions.

While working on a project to build a device for testing and balancing large battery packs, I needed a power supply of around 90 V, so I bought two 48 V, 2.5 A power supplies. They turned out to be unexpectedly decent despite their low price, both in terms of performance and build quality. As usual: inspection, schematic, tests, conclusions.

Today’s review is about some uncommon, specialized devices that can nevertheless be very useful: powerful, compact voltage converters. What makes them unusual is their 36–75 V input voltage range, which is rarely used by DIYers. But I’ve been asked about converters like these several times, so I decided to fill that gap, since I haven’t come across any reviews of them.

This is already the third review of RuiDeng products that I’ve posted, but there are actually quite a few reviews of their products out there, so today I’ll try to add a little to the previous ones—especially since this converter is interesting in its own right. As always, I’ll take a look at it, run some tests, cover a little theory, and share my conclusions.

Today I have another review of another power supply. I realize I may have already worn you out with these, but several readers asked me about this one, and I was interested in it myself, so I went ahead and bought it. The review will consist mostly of photos and a little text. In addition to the tests, I’ll also describe a simple method for testing a PSU relatively safely while it’s operating at a temperature close to its limit.

Many of my readers know how much I enjoy writing power supply reviews. It’s probably my favorite topic. But today’s review will be a little different from my usual ones—and for good reason, it’ll be short. So, if you’re interested in switching power supplies, come on in.

For some reason, there are very few reviews of power supplies like this. That’s understandable: buyers are usually more interested in high-power models than in little units rated at just 3 W. But compact models are sometimes exactly what you need for various low-power devices, especially when they’re highly reliable. Today I’m taking a look at just such a power supply, made by Hi-Link.

Today on my workbench I have an adjustable voltage converter with an output voltage of up to 50 V and a current of up to 20 A. As far as I know, this is the most powerful converter in RuiDeng's product lineup. What's more, its specifications are very similar to those of the ZXY-6020, which I reviewed earlier and will be comparing it with today. While I'm at it, I'd like to say a big thank-you to one of my regular readers, without whom this review probably wouldn't have happened.

To be honest, I ordered this kit mostly to fill out the package, but it turned out to be quite useful, especially for beginner electronics hobbyists. A while ago, I reviewed a simple adjustable power supply, and as it turned out, it was useful. Now imagine something similar, but: With a higher output voltage With more current With transformer winding switching With fan control Interested? Then I don't think you'll regret it.

I've been asked about reviews of converters like these many times, both in the comments and in private messages. I've seen plenty of reviews of similar devices, but somehow never got around to trying one myself. Partly because I already have quite a few different adjustable power supplies, and partly because I have a general idea of what these converters are and how they work. But as it happened, I needed exactly this kind of converter for a project, so I decided to order one for a review. This won't be a very long review. It'll mostly be about my personal opinion of the converter itself, its design and controls, and my overall impressions compared with models from ZXY.

Standalone devices that support Quick Charge are becoming increasingly common, so I decided to take a closer look at what “feeds” these “pets”—a QC 3.0 charger (power supply). It’s very compact, but you can read all about it in the review: as usual, I’ll take a look, run some tests, take it apart, and share my conclusions.

Another power supply has landed in my hands. I didn't buy it; a friend of mine did, but that doesn't matter here. What caught my attention first was its claimed output of 400 W, its fairly compact size, and the fact that it has power factor correction.

Hello everyone. I put together a short review of a “new” used 12V-10A board (claimed). First, I apologize for any inaccuracies or mistakes. I’ve never written a review before.

It’s been a while since I last wrote about voltage converters. Today I’m reviewing not just a converter, but one with the added ability to work with QC 2.0 and 3.0 protocols. This won’t be a very long review, but I hope it’ll be useful.

As more and more devices have been connected to local networks, people have also wanted to power them remotely. After all, you’ll agree that running a separate cable to a small device that’s already connected by its own data cable is not only inconvenient, but expensive too. So today we’ll talk about what PoE is and “how it works.”